How to specify any number as a valid property key in Mongoose? - node.js

Question

I want to store sensor data in MongoDB, say at a frequency of 1hz. To do this efficiently I want to do it the way this article recommends, namely storing multiple data points in the same document, using the number of seconds elapsed as object properties.
This is how I want a typical document to look:
const record = {
startingHour: 'Sun Sep 11 2016 03:00:00', // Date object
values: {
0: { // minute
0: { lat: 52.0001, lon: 13.0001 },
// ... all other seconds
59: { lat: 52.9999, lon: 13.9999 }
},
// ... all other minutes
59: {
0: { lat: 53.0001, lon: 14.0001 },
// ...
59: { lat: 53.9999, lon: 14.9999 }
}
}
}
How could I specify in Mongoose that I want each document t represent an hour with 60 properties, each key being a number from 1 to 59 - one for each minute - and each of those properties to have 60 properties in turn, and those records to represent the actual location values?
So to save a new record I would do record.values.59.59 = { lat: 53.9999, lon: 14.9999 }
How could I represent this kind of schema in Mongoose?

Answer 1

I managed to do it by creating functions to generate the objects I want. I then use those generated objects as schemas, embed one within the other and put those in the final schema:
/**
* Functions to generate objects for Minutes and Seconds
* Each object containing 60 keys, going from 0 to 59
*/
function second() {
let obj = {};
for (var i = 0; i < 60; i++) {
obj[i] = Location;
}
return obj;
}
function minute() {
let obj = {};
for (var i = 0; i < 60; i++) {
obj[i] = Second;
}
return obj;
}
const Location = new Schema({
latitude: { type: Number, required: true },
longitude: { type: Number, required: true }
});
// Instantiates Second and Minute objects as schemas
const Second = new Schema(second());
const Minute = new Schema(minute());
// Actual schema
const RecordSchema = new Schema({
startingHour: {
type: Date,
required: true
},
values: {
type: Minute
}
});
This allows me to save objects like these:
{
startingHour: new Date(),
values: {
0: {
0: {
location: { latitude: 0.03, longitude: 51.7 }
},
1: {
location: { latitude: 0.03, longitude: 51.7 }
}
// ...
},
// ...
59: {
// ...
59: {
location: { latitude: 0.03, longitude: 51.7 }
}
}
}
}